It's a good idea to check the oil level once in a while. On a newer car, it might not change at all. But as a car piles up miles - particularly after it crosses 100K miles - it can start to consume oil, and the rate of consumption can accelerate over time. If it's using, say, a quart every 2000 miles, which is not considered excessive, and you change your oil every 7500 miles as recommended in the manual, between oil changes your oil level can drop low enough for your engine to seize. The low oil warning light should come on to warn you, but it may not do so before damage occurs.
My MDX is not using much oil right now, but I still check my oil level every 1000 miles and I keep track of it in a spreadsheet so I know about how much it is consuming and when I will need to add more. When I had a car that was using a fair amount of oil I was checking it with every gas tank fillup.
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